CA DWR CDEC Interface

The California Department of Water Resources keeps much of their
river flow data on the web, at the
California Data Exchange Center.
Their interface is a little clumsy, though, so I made my own - single-button
queries for just the rivers I'm interested in.
This is still missing some rivers I'd like to have - for example, CDEC only
has gage heights instead of CFS for the Carson, West Walker, and Noyo.
But it'll do for now!